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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //usr/include/rdma/efa-abi.h

/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) */
/*
 * Copyright 2018-2023 Amazon.com, Inc. or its affiliates. All rights reserved.
 */

#ifndef EFA_ABI_USER_H
#define EFA_ABI_USER_H

#include <linux/types.h>

/*
 * Increment this value if any changes that break userspace ABI
 * compatibility are made.
 */
#define EFA_UVERBS_ABI_VERSION 1

/*
 * Keep structs aligned to 8 bytes.
 * Keep reserved fields as arrays of __u8 named reserved_XXX where XXX is the
 * hex bit offset of the field.
 */

enum {
	EFA_ALLOC_UCONTEXT_CMD_COMP_TX_BATCH  = 1 << 0,
	EFA_ALLOC_UCONTEXT_CMD_COMP_MIN_SQ_WR = 1 << 1,
};

struct efa_ibv_alloc_ucontext_cmd {
	__u32 comp_mask;
	__u8 reserved_20[4];
};

enum efa_ibv_user_cmds_supp_udata {
	EFA_USER_CMDS_SUPP_UDATA_QUERY_DEVICE = 1 << 0,
	EFA_USER_CMDS_SUPP_UDATA_CREATE_AH    = 1 << 1,
};

struct efa_ibv_alloc_ucontext_resp {
	__u32 comp_mask;
	__u32 cmds_supp_udata_mask;
	__u16 sub_cqs_per_cq;
	__u16 inline_buf_size;
	__u32 max_llq_size; /* bytes */
	__u16 max_tx_batch; /* units of 64 bytes */
	__u16 min_sq_wr;
	__u8 reserved_a0[4];
};

struct efa_ibv_alloc_pd_resp {
	__u32 comp_mask;
	__u16 pdn;
	__u8 reserved_30[2];
};

enum {
	EFA_CREATE_CQ_WITH_COMPLETION_CHANNEL = 1 << 0,
	EFA_CREATE_CQ_WITH_SGID               = 1 << 1,
};

struct efa_ibv_create_cq {
	__u32 comp_mask;
	__u32 cq_entry_size;
	__u16 num_sub_cqs;
	__u8 flags;
	__u8 reserved_58[5];
};

enum {
	EFA_CREATE_CQ_RESP_DB_OFF = 1 << 0,
};

struct efa_ibv_create_cq_resp {
	__u32 comp_mask;
	__u8 reserved_20[4];
	__aligned_u64 q_mmap_key;
	__aligned_u64 q_mmap_size;
	__u16 cq_idx;
	__u8 reserved_d0[2];
	__u32 db_off;
	__aligned_u64 db_mmap_key;
};

enum {
	EFA_QP_DRIVER_TYPE_SRD = 0,
};

struct efa_ibv_create_qp {
	__u32 comp_mask;
	__u32 rq_ring_size; /* bytes */
	__u32 sq_ring_size; /* bytes */
	__u32 driver_qp_type;
};

struct efa_ibv_create_qp_resp {
	__u32 comp_mask;
	/* the offset inside the page of the rq db */
	__u32 rq_db_offset;
	/* the offset inside the page of the sq db */
	__u32 sq_db_offset;
	/* the offset inside the page of descriptors buffer */
	__u32 llq_desc_offset;
	__aligned_u64 rq_mmap_key;
	__aligned_u64 rq_mmap_size;
	__aligned_u64 rq_db_mmap_key;
	__aligned_u64 sq_db_mmap_key;
	__aligned_u64 llq_desc_mmap_key;
	__u16 send_sub_cq_idx;
	__u16 recv_sub_cq_idx;
	__u8 reserved_1e0[4];
};

struct efa_ibv_create_ah_resp {
	__u32 comp_mask;
	__u16 efa_address_handle;
	__u8 reserved_30[2];
};

enum {
	EFA_QUERY_DEVICE_CAPS_RDMA_READ = 1 << 0,
	EFA_QUERY_DEVICE_CAPS_RNR_RETRY = 1 << 1,
	EFA_QUERY_DEVICE_CAPS_CQ_NOTIFICATIONS = 1 << 2,
	EFA_QUERY_DEVICE_CAPS_CQ_WITH_SGID     = 1 << 3,
	EFA_QUERY_DEVICE_CAPS_DATA_POLLING_128 = 1 << 4,
	EFA_QUERY_DEVICE_CAPS_RDMA_WRITE = 1 << 5,
};

struct efa_ibv_ex_query_device_resp {
	__u32 comp_mask;
	__u32 max_sq_wr;
	__u32 max_rq_wr;
	__u16 max_sq_sge;
	__u16 max_rq_sge;
	__u32 max_rdma_size;
	__u32 device_caps;
};

#endif /* EFA_ABI_USER_H */

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